| Remote sensing monitoring analysis for the multiple cropping index of the cultivated land in Shaanxi Province based on the long time-series NDVI |
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| DOI：10.7606/j.issn.1000-7601.2014.03.032 |
| Key Words: multiple cropping index normalized difference vegetation index HANTS filter Savitzky-Golay filter remote sensing Shaanxi Province |
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| Abstract: |
| The multiple cropping index reflects the degree of arable land utilizing intensity at a certain period. Extracting multiple cropping index by remote sensing method could provide scientific basis for agricultural industrial structure adjustment and food security. We adopted the SPOT/VGT NDV
I time-series data (2001—2007) and MOD13Q1 NDVI time-series data (2001—2011) for the remote sensing data sources, reconstructed the data for these two data sources by using the HANTS filter and Savitzky-Golay filter method, and then extracted the multiple cropping indexes of 10 cities in Shaanxi Province. According to the extracted results, analyzed the variation rule of the multiple cropping index in each city, and then compared the effects of two methods for extracting the multiple cropping indexes. The result showed that: Both methods can be better reflected the change trend of the multiple cropping index. The extraction result of Savitzky-Golay filter was generally higher than the HANTS filter. The multiple cropping index was increased obvious quick in Yulin city and Yan’an city from 2001 to 2011, while the figures in Xi’an city has been shown a negative increase. After 2007, the multiple cropping indexes were begun to appear the negative increase in Tongchuan, Baoji, Xianyang and Weinan. |
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